CVE-2025-9031: DivvyDrive Web Timing Discrepancy Vulnerability

CVE-2025-9031 Overview

CVE-2025-9031 is an observable timing discrepancy vulnerability [CWE-203] in DivvyDrive Web, a file sharing and collaboration platform developed by DivvyDrive Information Technologies Inc. The flaw allows cross-domain search timing attacks, enabling an authenticated remote attacker to infer information about resources by measuring response time differences. The vulnerability affects DivvyDrive Web versions from 4.8.2.2 before 4.8.2.15. Turkey's national cyber incident response center (USOM) published advisory TR-25-0293 covering this issue.

Critical Impact
Authenticated attackers can leverage timing side channels across domains to disclose limited information about search operations or protected resources without triggering standard access control failures.

Affected Products

DivvyDrive Web 4.8.2.2
DivvyDrive Web versions after 4.8.2.2 and before 4.8.2.15
DivvyDrive Web deployments that have not applied vendor update 4.8.2.15

Discovery Timeline

2025-09-24 - CVE-2025-9031 published to the National Vulnerability Database
2026-09-26 - Last updated in NVD database

Technical Details for CVE-2025-9031

Vulnerability Analysis

The vulnerability stems from measurable differences in server response time when DivvyDrive Web processes search operations. An attacker who can issue search requests, or induce a victim's browser to issue them from a different origin, can measure how long each response takes. Those timing differences correlate with properties of the underlying data, such as whether a resource exists or matches a given query. This class of side channel is tracked under CWE-203: Observable Discrepancy.

The attack does not require breaking authentication logic directly. Instead it uses legitimate request paths and infers protected information from observable timing behavior. The confidentiality impact is limited, and integrity and availability are not affected.

Root Cause

The root cause is non-constant-time handling of search operations in DivvyDrive Web. The processing path returns a response in a time that depends on the search content or state of the data store. Cross-domain requests observe these variations because the server does not normalize response time before replying.

Attack Vector

Exploitation requires network access and low-level authenticated privileges. An attacker crafts repeated search requests, or hosts a page that triggers them from a victim's browser session, and records response latencies. By comparing distributions of request times, the attacker infers properties of the search index or targeted resource. See USOM advisory TR-25-0293 and the Siber Güvenlik advisory for vendor-coordinated details. No public proof-of-concept code is available for this issue.

Detection Methods for CVE-2025-9031

Indicators of Compromise

Repeated search queries from a single authenticated session with narrowly varying parameters, consistent with timing probes
Cross-origin requests to DivvyDrive Web search endpoints originating from unexpected referrers
Elevated request volumes to search endpoints without corresponding user interface activity

Detection Strategies

Baseline normal search request volume per user and alert on statistical outliers in request frequency
Correlate web server access logs with authentication events to identify sessions issuing high-cardinality, low-variation queries
Inspect HTTP referrer and Origin headers on search endpoints to flag cross-domain calls that bypass the DivvyDrive UI

Monitoring Recommendations

Enable verbose logging on DivvyDrive Web search endpoints, including per-request latency measurements
Forward web and application logs to a centralized analytics platform for anomaly detection on search behavior
Review audit logs for authenticated accounts generating atypical automated query patterns

How to Mitigate CVE-2025-9031

Immediate Actions Required

Upgrade DivvyDrive Web to version 4.8.2.15 or later as published by the vendor
Inventory all DivvyDrive Web instances and confirm the installed version against the fixed release
Review authentication logs for suspicious automated search activity preceding the patch

Patch Information

The vendor fixed the issue in DivvyDrive Web 4.8.2.15. Administrators running any build from 4.8.2.2 up to but not including 4.8.2.15 should apply the update. Refer to USOM advisory TR-25-0293 and the Turkish national cyber security advisory for the authoritative vendor coordination record.

Workarounds

Restrict access to DivvyDrive Web to trusted network segments or via a reverse proxy that enforces strict Origin and Referer validation
Apply rate limiting on search endpoints to reduce the signal available to timing-based probes
Enforce short session timeouts and strong authentication to limit the window for authenticated timing attacks

bash

# Example reverse-proxy rate limit for DivvyDrive search endpoint (nginx)
limit_req_zone $binary_remote_addr zone=divvy_search:10m rate=10r/m;

location /api/search {
    limit_req zone=divvy_search burst=5 nodelay;
    proxy_pass http://divvydrive_backend;
}